Acquisitions - Purchase Price Allocation of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Intangible assets		109,758
Customer relationships [Member]
Business Acquisition [Line Items]
Intangible assets		77,654
Customer relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Weighted Average Useful Lives (in Years)		10 years
Customer relationships [Member] | Maximum [Member]
Business Acquisition [Line Items]
Weighted Average Useful Lives (in Years)		20 years
Trade names and trademarks-indefinite [Member]
Business Acquisition [Line Items]
Intangible assets		16,900
Merchant network [Member]
Business Acquisition [Line Items]
Weighted Average Useful Lives (in Years)		10 years
Intangible assets		4,604
Software [Member]
Business Acquisition [Line Items]
Intangible assets		9,800
Software [Member] | Minimum [Member]
Business Acquisition [Line Items]
Weighted Average Useful Lives (in Years)		3 years
Software [Member] | Maximum [Member]
Business Acquisition [Line Items]
Weighted Average Useful Lives (in Years)		10 years
Non-compete Agreements [Member]
Business Acquisition [Line Items]
Intangible assets		800
Non-compete Agreements [Member] | Minimum [Member]
Business Acquisition [Line Items]
Weighted Average Useful Lives (in Years)	2 years	2 years
Non-compete Agreements [Member] | Maximum [Member]
Business Acquisition [Line Items]
Weighted Average Useful Lives (in Years)	6 years	6 years